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We investigate magnonic band structure in thin homogeneous permalloy filmdecorated with periodic array of elliptically shaped permalloy dots andseparated by non-magnetic Pt spacer. We demonstrated experimentally formationof the magnonic band structure for Damon-Eshbach wave propagating in permalloyfilm with the band gap opened at the Brillouin zone border and band splittingat smaller wavenumbers, due to the Bragg interference and interaction ofpropagating wave of the continuous film with a standing resonant mode of thenano-ellipses, respectively. The shape anisotropy of the permalloy nanodotsallows to control the spin wave dynamics through the switch between two statesof the magnetization with respect to the underneath film magnetization, thusenabling magnonic band structure reprogrammability. With numerical analysis weshow, that predominant role in formation of the magnonic band structure isplayed by a vertical dynamic coupling between propagating wave in the film andmagnetization oscillations in the nanodots.

Magnonic band gap and mode hybridization in continuous Permalloy film induced by vertical coupling with an array of Permalloy ellipses